What happens when composer executes the command prompt 'Killed'?

This article is written by the tutorial column of composer to introduce to you the problem of "Killed" when executing composer require after a while. I hope it will be helpful to friends in need!

Specific problem:

When executing composer require, it prompts "Killed" after a while

composer require voku/simple_html_dom -vvv
Reading ./composer.json
Loading config file ./composer.json
Checked CA file /etc/pki/tls/certs/ca-bundle.crt: valid
Failed to initialize global composer: Composer could not find the config file: /home/admin/.composer/composer.json
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section
Reading /home/wwwroot/vendor/composer/installed.json
Loading plugin EasyWeChatComposer\Plugin
Loading plugin think\composer\Plugin
Running 1.7.2 (2018-08-16 16:57:12) with PHP 7.1.18 on Linux / 2.6.32-696.16.1.el6.x86_64
Downloading https://repo.packagist.org/packages.json
Writing /home/admin/.composer/cache/repo/https---repo.packagist.org/packages.json into cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2013.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2014.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2015.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2016.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2017.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2018.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-01.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-04.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-07.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-10.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-archived.json from cache
Downloading http://repo.packagist.org/p/provider-latest%24502b160e3dcbe13f8c125df618d18632ebbad2402f1e07d96e00bf46c3da14ac.json
Writing /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-latest.json into cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-voku$simple-html-dom.json from cache
Using version ^4.7 for voku/simple_html_dom
./composer.json has been updated
Reading ./composer.json
Loading config file ./composer.json
Failed to initialize global composer: Composer could not find the config file: /home/admin/.composer/composer.json
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section
Reading /home/wwwroot/vendor/composer/installed.json
Loading plugin EasyWeChatComposer\Plugin_composer_tmp0
Loading plugin think\composer\Plugin_composer_tmp1
Reading ./composer.lock
Loading composer repositories with package information
Downloading https://repo.packagist.org/packages.json
Writing /home/admin/.composer/cache/repo/https---repo.packagist.org/packages.json into cache
Updating dependencies (including require-dev)
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2013.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2014.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2015.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2016.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2017.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2018.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-01.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-04.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-07.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-2019-10.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-archived.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/p-provider-latest.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-adbario$php-dot-notation.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-clagiordano$weblibs-configmanager.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-danielstjules$stringy.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-guzzlehttp$guzzle.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-mtdowling$jmespath.php.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-alibabacloud$client.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-symfony$polyfill-mbstring.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-guzzlehttp$psr7.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-guzzlehttp$promises.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-psr$http-message.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-ralouphie$getallheaders.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-aliyuncs$oss-sdk-php.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-doctrine$cache.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-easywechat-composer$easywechat-composer.json from cache
Reading /home/admin/.composer/cache/repo/https---repo.packagist.org/provider-symfony$options-resolver.json from cache

Solution:

Generally, insufficient memory causes the process to be killed.

If you cannot increase the physical memory, you can consider expanding the swap partition.

Reference is as follows:

composer error is killed when installing or updating because the current memory is insufficient.

free -m
mkdir -p /var/_swap_
cd /var/_swap_
#Here, 1M * 2000 ~= 2GB of swap memory
dd if=/dev/zero of=swapfile bs=1M count=2000
mkswap swapfile
swapon swapfile
echo “/var/_swap_/swapfile none swap sw 0 0” >> /etc/fstab
#cat /proc/meminfo
free -m

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